In contrast to HW what they have basically done is:
-Removed Aero (18s) due to the purge of the cross class system
-Increased the duration of Combust to 30s from 18s
-Significantly increased the amount of ogcds
-Increased the mp cost of A.Benefic making it no longer as viable for double weaving or movement.

At the moment we only have one instant cast damage spell every 30s which makes the job very clunky to play due to the massive overload of ogcds AST has now.
Whm and Sch both have it a lot easier to get around their ogcds. Aero's duration is only 18s and it also has its initial 30 potency on hit. Not to mention Regen only costing 840 mp compared to AST's 1440. Sch has Ruin 2 and Miasma 2 giving it a really easy time.

I propose SE gives AST something like Ruin 2 (bring Stella back as an instant cast?) or a dot that has a weaker potency than your Malefic 3 to counter the majority of the clipping issue. Nothing job breaking but would make it more fun and engaging to play.